案例：html/html5 案例     状态：可编辑再运行    进入竖版
 运行结果　
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<!DOCTYPE html>
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<html>
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<body>
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​
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<audio controls>
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<source src="/img/horse.ogg" type="audio/ogg">
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<source src="/img/horse.mp3" type="audio/mpeg">
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Your browser does not support the audio element.
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</audio>
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​
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</body>
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</html>
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​